{"answers":{"affected":"4 open source packages ship an affected version, including github.com/forgekeep/nebula-mesh and github.com/juev/nebula-mesh.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55513 exists.","fix":"Upgrade github.com/forgekeep/nebula-mesh to 0.5.0 or later.","what":"CVE-2026-55513 is a medium-severity vulnerability in forgekeep nebula-mesh, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-55513 and fix it if it is affected.\n\nWhat it is: CVE-2026-55513 is a medium-severity vulnerability in forgekeep nebula-mesh, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55513 exists.\n\nAffected packages and fixed versions:\n- github.com/forgekeep/nebula-mesh (Go): affected from 0.3.0; fixed in 0.5.0\n- github.com/forgekeep/nebula-mesh (Go): affected from 0.3.0; fixed in 0.5.0\n- github.com/forgekeep/nebula-mesh (Go): affected from 0.4.0; fixed in 0.5.0\n- github.com/juev/nebula-mesh (Go): affected from 0.3.0; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-55513/ (Markdown: https://insights.sbomify.com/CVE-2026-55513/index.md)","id":"CVE-2026-55513","markdown":"https://insights.sbomify.com/CVE-2026-55513/index.md","name":"CVE-2026-55513","record":{"aliases":["GHSA-g4x6-jcvr-9m3g","GO-2026-5987"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Nebula mesh VPN control plane","requires_auth":"low_privilege","summary":"Authenticated operators can bypass configured enrollment token TTL limits via the Web UI, minting tokens valid for 24 hours instead of the intended shorter duration.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-613","name":"DEPRECATED: Insufficient Session Expiration"}],"description":"nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.3.0 to before version 0.5.0, the nebula-mgmt Web UI host-creation path ignores both the server-wide enrollment_token_ttl security setting and per-network network_config.enrollment_token_ttl overrides. API host creation and token-regeneration paths use the configured TTL resolver, but POST /ui/hosts hardcodes now.Add(24 * time.Hour) for newly minted agent enrollment tokens. In deployments that intentionally reduce enrollment-token lifetime, any authenticated operator who can create a host through the Web UI can still mint a bearer enrollment token valid for about 24 hours. This issue has been patched in version 0.5.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hour bearer enrollment tokens","id":"CVE-2026-55513","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"vLLM denial of service via prompt embeds on M-RoPE models","id":"CVE-2026-55514"},"packages":[{"ecosystem":"Go","fixed":["0.5.0"],"introduced":["0.3.0"],"last_affected":[],"package":"github.com/forgekeep/nebula-mesh","purl":null,"source":"GHSA-g4x6-jcvr-9m3g"},{"ecosystem":"Go","fixed":["0.5.0"],"introduced":["0.3.0"],"last_affected":[],"package":"github.com/forgekeep/nebula-mesh","purl":"pkg:golang/github.com/forgekeep/nebula-mesh","source":"GHSA-g4x6-jcvr-9m3g"},{"ecosystem":"Go","fixed":["0.5.0"],"introduced":["0.4.0"],"last_affected":[],"package":"github.com/forgekeep/nebula-mesh","purl":"pkg:golang/github.com/forgekeep/nebula-mesh","source":"GO-2026-5987"},{"ecosystem":"Go","fixed":[],"introduced":["0.3.0"],"last_affected":[],"package":"github.com/juev/nebula-mesh","purl":"pkg:golang/github.com/juev/nebula-mesh","source":"GO-2026-5987"}],"prev":{"headline":"nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entries without rate limiting","id":"CVE-2026-55512"},"products":["nebula-mesh"],"published":"2026-09-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-08","vendors":["forgekeep"]},"summary":"Authenticated operators can bypass configured enrollment token TTL limits via the Web UI, minting tokens valid for 24 hours instead of the intended shorter duration.","url":"https://insights.sbomify.com/CVE-2026-55513/"}